I can't speak for parent's use case, but wireless charging isn't going to do me much good at 35K feet on an airplane. A possible solution to parent's needs, depending on the use case, is a LimeFuel battery pack [0]. US$40, keeps my wife and I watching movies on the Galaxy Note and an iPad on cross-country flights with plenty to spare. I don't need a spare, swappable battery all that often, so something versatile like the LimeFuel (which can charge anything that uses a USB port) suits my needs better.
As a sidenote, I haven't found wireless charging to be all that anyway. It makes the phone thicker (either built-in or with a wireless charging case), and all it does is save me the two seconds it takes to put a plug in the end of the phone. I've got the wireless charging case for the Samsung Galaxy Note 3 and seldom use it.
[0] http://www.amazon.com/External-Battery-Pack-Limefuel-L130X/d...